Re: Colorsync-users Digest, Vol 2, Issue 290
Re: Colorsync-users Digest, Vol 2, Issue 290
- Subject: Re: Colorsync-users Digest, Vol 2, Issue 290
- From: Guy Schepens <email@hidden>
- Date: Fri, 29 Jul 2005 13:38:30 +0200
Sorry, I´m currently not in the office (vacation). I´ll be back on August 22, 2005.
In urgent cases please contact Bart Fret (email@hidden) +32 (0)15 272502
or Michael Sanborn (email@hidden) +1 (888) 228 9070 ext. 3
Guy Schepens
Technical Support
PerfectProof Europe NV
Ondernemingsnummer/Numéro d'entreprise : BE 0458.561.857
PerfectProof Hardware BVBA
Ondernemingsnummer/Numéro d'entreprise : BE 0865.262.170>Send Colorsync-users mailing list submissions to
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>Today's Topics:
>
> 1. Re: LAB value for proofing stock (Roger Breton)
> 2. Re: Averaging multiple cmyk profiles from multiple cmyk
> target readings (Roger Breton)
> 3. Paper for proofing (MSD)
> 4. Re: Paper for proofing (Roger Breton)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Wed, 27 Jul 2005 16:08:02 -0400
>From: Roger Breton <email@hidden>
>Subject: Re: LAB value for proofing stock
>To: Kevin Muldoon <email@hidden>, ColorSync
> <email@hidden>
>Message-ID: <BF0D61E2.110EF%email@hidden>
>Content-Type: text/plain; charset=US-ASCII
>
>> What exactly is the paper white LAB value for SWOP? How
>> about SNAP? Does anyone have these values?
>
>My god, this is changing right now, now that SWOP's proofing stock has
>shifted from Champion Texweb to Tembec Monterrey. I still have to find time
>to order a calibrated press sheet in order to tell you. I'll know when I
>measure it.
>
>Maybe others have already gone that path and could inform us here?
>
>Roger Breton | Laval, Canada | email@hidden
>http://pages.infinit.net/graxx
>
>
>
>
>------------------------------
>
>Message: 2
>Date: Wed, 27 Jul 2005 16:21:26 -0400
>From: Roger Breton <email@hidden>
>Subject: Re: Averaging multiple cmyk profiles from multiple cmyk
> target readings
>To: "Millers' Photography L.L.C" <email@hidden>,
> ColorSync <email@hidden>
>Message-ID: <BF0D6506.110F2%email@hidden>
>Content-Type: text/plain; charset=US-ASCII
>
>> Please comment on printing muliple cmyk targets for a press, reading and
>> creating the multiple pofiles and then averaging them.
>
>David,
>
>There's no question that press profiles can hardly be derived from one
>single sheet. Just how many sheets and which sheets is the toughest
>question. In my practice, I have aproached it from the point of view of a
>statistician. As you know, there are many sampling strategies. I first used
>stratified samples but then I reason that this does not represent the true
>underlying nature of the process which, IMHO, has a random component to it.
>You have to think about how is it that colors vary on a printing press
>throughout some pressrun. In large runs, you'll see the pressman adjusting
>ink density upwards or downwards but always around some *central* values,
>the target or standard. But, in my view, I have not studied this extensively
>or rigorously, btw, if nothing major is breaking in a press during the run,
>the color will vary randomly and the true measure of the press color will
>follow and random variable that is normally distributed around the mean.
>That's my theory. So, say in a sample of 500 press sheets, I'll take 30
>readings of a random selection and average the results. Now that's the first
>part of this process. There is a second part to this? Yes, it's called
>"smoothing". And to my knowledge not too many profilers allow you to do
>this. Maybe others can correct me here? I'd love to hear it from the
>horses's mouth. But in PrintOpen5, there is a function with a scale to
>gradually smooth measurements. So, on top of averaging, I also practice
>smoothing. But I'm getting away from the subject...
>
>Regards,
>
>Roger Breton | Laval, Canada | email@hidden
>http://pages.infinit.net/graxx
>
>
>
>
>------------------------------
>
>Message: 3
>Date: Wed, 27 Jul 2005 17:37:19 -0700
>From: MSD <email@hidden>
>Subject: Paper for proofing
>To: email@hidden
>Message-ID: <email@hidden>
>Content-Type: text/plain; charset=us-ascii; format=flowed
>
>I am using Heidelberg Saphira Satin at this time.
>Am I amn idiot - or what?
>
>MSD
>
>
>------------------------------
>
>Message: 4
>Date: Wed, 27 Jul 2005 20:45:51 -0400
>From: Roger Breton <email@hidden>
>Subject: Re: Paper for proofing
>To: MSD <email@hidden>, ColorSync
> <email@hidden>
>Message-ID: <BF0DA2FF.1110F%email@hidden>
>Content-Type: text/plain; charset=US-ASCII
>
>> I am using Heidelberg Saphira Satin at this time.
>> Am I amn idiot - or what?
>>
>> MSD
>
>Dear MSD,
>
>Are you using it with Epson UC inks?
>
>Regards,
>
>Roger Breton | Laval, Canada | email@hidden
>http://pages.infinit.net/graxx
>
>
>
>
>------------------------------
>
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>End of Colorsync-users Digest, Vol 2, Issue 290
>***********************************************
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